<template>
  <view class="uni-countdown">
    <text v-if="showDay" :style="{ borderColor: borderColor, color: color, backgroundColor: backgroundColor }" class="uni-countdown__number">{{ d }}</text>
    <text v-if="showDay" :style="{ color: splitorColor }" class="uni-countdown__splitor">天</text>
    <text :style="{ borderColor: borderColor, color: color, backgroundColor: backgroundColor }" class="uni-countdown__number">{{ h }}</text>
    <text :style="{ color: splitorColor }" class="uni-countdown__splitor">{{ showColon ? ':' : '时' }}</text>
    <text :style="{ borderColor: borderColor, color: color, backgroundColor: backgroundColor }" class="uni-countdown__number">{{ i }}</text>
    <text :style="{ color: splitorColor }" class="uni-countdown__splitor">{{ showColon ? ':' : '分' }}</text>
    <text :style="{ borderColor: borderColor, color: color, backgroundColor: backgroundColor }" class="uni-countdown__number">{{ s }}</text>
    <text v-if="!showColon" :style="{ color: splitorColor }" class="uni-countdown__splitor">秒</text>
  </view>
</template>
<script>
/**
 * Countdown 倒计时
 * @description 倒计时组件
 * @tutorial https://ext.dcloud.net.cn/plugin?id=25
 * @property {String} backgroundColor 背景色
 * @property {String} color 文字颜色
 * @property {Number} day 天数
 * @property {Number} hour 小时
 * @property {Number} minute 分钟
 * @property {Number} second 秒
 * @property {Boolean} showDay = [true|false] 是否显示天数
 * @property {Boolean} showColon = [true|false] 是否以冒号为分隔符
 * @property {String} splitorColor 分割符号颜色
 * @event {Function} timeup 倒计时时间到触发事件
 * @example <uni-countdown :day="1" :hour="1" :minute="12" :second="40"></uni-countdown>
 */
export default {
  name: 'UniCountdown',
  props: {
    showDay: {
      type: Boolean,
      default: true,
    },
    showColon: {
      type: Boolean,
      default: true,
    },
    backgroundColor: {
      type: String,
      default: '#FFFFFF',
    },
    borderColor: {
      type: String,
      default: '#000000',
    },
    color: {
      type: String,
      default: '#000000',
    },
    splitorColor: {
      type: String,
      default: '#000000',
    },
    day: {
      type: Number,
      default: 0,
    },
    hour: {
      type: Number,
      default: 0,
    },
    minute: {
      type: Number,
      default: 0,
    },
    second: {
      type: Number,
      default: 0,
    },
  },
  data() {
    return {
      timer: null,
      syncFlag: false,
      d: '00',
      h: '00',
      i: '00',
      s: '00',
      leftTime: 0,
      seconds: 0,
    };
  },
  watch: {
    day(val) {
      this.changeFlag();
    },
    hour(val) {
      this.changeFlag();
    },
    minute(val) {
      this.changeFlag();
    },
    second(val) {
      this.changeFlag();
    },
  },
  created: function (e) {
    this.startData();
  },
  beforeDestroy() {
    clearInterval(this.timer);
  },
  methods: {
    toSeconds(day, hours, minutes, seconds) {
      return day * 60 * 60 * 24 + hours * 60 * 60 + minutes * 60 + seconds;
    },
    timeUp() {
      clearInterval(this.timer);
      this.$emit('timeup');
    },
    countDown() {
      let seconds = this.seconds;
      let [day, hour, minute, second] = [0, 0, 0, 0];
      if (seconds > 0) {
        day = Math.floor(seconds / (60 * 60 * 24));
        hour = Math.floor(seconds / (60 * 60)) - day * 24;
        minute = Math.floor(seconds / 60) - day * 24 * 60 - hour * 60;
        second = Math.floor(seconds) - day * 24 * 60 * 60 - hour * 60 * 60 - minute * 60;
      } else {
        this.timeUp();
      }
      if (day < 10) {
        day = '0' + day;
      }
      if (hour < 10) {
        hour = '0' + hour;
      }
      if (minute < 10) {
        minute = '0' + minute;
      }
      if (second < 10) {
        second = '0' + second;
      }
      this.d = day;
      this.h = hour;
      this.i = minute;
      this.s = second;
    },
    startData() {
      this.seconds = this.toSeconds(this.day, this.hour, this.minute, this.second);
      if (this.seconds <= 0) {
        return;
      }
      this.countDown();
      this.timer = setInterval(() => {
        this.seconds--;
        if (this.seconds < 0) {
          this.timeUp();
          return;
        }
        this.countDown();
      }, 1000);
    },
    changeFlag() {
      if (!this.syncFlag) {
        this.seconds = this.toSeconds(this.day, this.hour, this.minute, this.second);
        this.startData();
        this.syncFlag = true;
      }
    },
  },
};
</script>
<style scoped>
.uni-countdown {
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  flex-direction: row;
  justify-content: flex-start;
  padding: 2rpx 0;
}

.uni-countdown__splitor {
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  justify-content: center;
  line-height: 48rpx;
  padding: 5rpx;
  font-size: 24rpx;
}

.uni-countdown__number {
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  justify-content: center;
  align-items: center;
  width: 52rpx;
  height: 48rpx;
  line-height: 48rpx;
  margin: 5rpx;
  text-align: center;
  font-size: 24rpx;
}
</style>
